Bushing for tubular radiators



Feb. 5, 19240 W. J. BUETTNER BUSHING FOR TUBULAR RADIATORS Filed April 17, 1922 Patented Feb. 5, lQE-la WHLIAM Il'. BUETTNER, OF CARNEGIE, Pml'NSYL'VANi-l.

BUSHNG FOR TUBULR RMIATBRS.

Application filed pril 17, 1922.

Be it known that l, Wimmer J. Bun'r'r- NEB, a citizen ot the United States, residing at Carnegie. in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Bushings for rlubular Radiators, of which the following is a specification.

This invention relates to tube bushings and more in particular to bushings used in connection with tubular radiators for selfpropelled vehicles.

Une of the principal objects is to provide a bushing which will enable the assembling of the cooling-tubes of a radiator without requiring the use of solder. A further object is to provide means for replacing a defective or damaged radiatortube without removing the surrounding tubes. Still a further object is to provide means for the expansion and contraction of the cooling tubes, due to heat or to jolts. -Further objects and advantages of my invention will appear from the description and drawings which `lorm a part ot this application.

ln the drawings:

Fig. l is a fragmentary View of a radiator showing my method ot assembling the cooling-tubes in the upper and lower end-plates of the radiator.

Fig. 2 is a view similar to Fig. l, excepting that the end-plates are made thinner and are provided with bosses for each coolingtube.

Fig. 3 is a cross-section showing a tubebushing made in one piece.

Fig. el is a top view corresponding to Fig. d.

Fig. 5 is a bottom view ol 3.

Fig. 6 is a cross-section showing a bushing made in two pieces.

Fig. 7 is a cross-section showing a moditied construction of a two-piece tube-bushln iig. d is a top view corresponding to Figures 6 and 'l'.

liig. 9 is a bottom view corresponding to Figures 6 and 7..

Referring to liigures 3 to 5, my one-piece tube-bushing consists or a polygonal head l provided with an outwardly threadled shank 2, preferably made slightly conic. A central hole 8 is drilled through the head and shank and the latter is further partly counterbored to form a concentric groove tion of two-part tube-bushing Serial No. 554,011.

et thus producing within the shank a depending sleeve portion 5. @ne or more slots G are cut through the outer shell 'T et the shank, to give the latter a certain resiliency when it is screwed tightly into the suitably drilled and tapped hole 8 of the end-plate 9. Each end ot the radiator-tube 10 is inserted in the groove el of a tube-bushing and the tube is held tight therein by the clamping ell'ect of the slotted shells as the bushings are screwed into the end-plates. rl`he bottom of the groove 4 is preferably beveled, as shown by numeral ll, and the ends of each radiator-tube are correspondingly beveled inwardly so that when the tube ends reachpthe bottom of the grooves, the tubes will be expanded outwardly. thus increasing the tightness of the contact between said tubes and bushings. The upper part of the central hole 3 is preferably tapped to receive a pipe plug 12 which is used tor quickly cutting out a damaged or leaky tube, when it is impossible to make a complete repair for lack ot time or material.

The modified construction shown in lFigures 6-8 and 9 differs from the construction just described in that the inner sleeve 13 is made separate and is then torce-driven in the outer shell-member ll which is pro- .vided with a polygonal head l5 and a tapered land threaded shell 16 having suitable slots 1'( to render the former resilient. rEhe inner sleeve l consists ol an enlarged part 18 iting tightly within the outer shell and a reduced part 19 which provides the groove-space necessary vlor the insertion of the cooling tube l0. The shoulder formed by the parts 18 and 19 is beveled to th inwardly beveled end ol the tube, for a pur pose stated above.

ln 1Fig. Y is illustrated a slight umili;

' nur in the foregoing paragraph. ine

ence consists in that the inner sleeve has been lengthened and provided with a plurality ol peripheral grooves El@ order to increase the leale-prostheses ct the Contact between the inner sleeve and the tube. This type et hushing is preferably used in radi ators tor steam operated sell-propelled vehicles, where greater pressures are he expected in the radiators.

The method oit installing or replacing a cooling tube is very simple and is follows: The tube-bushing is tiret screwed in the lower end-plate and the tube is then passed through the open hole in the vupper endplate and driven into the lower bushing. The upper bushing is now screwed into the upper end-plate and onto the tube until a tight tit is obtained at both ends of the tube. The tube-ends are generally coated outwardly with white-lead, litharge, or any suitable coating to provide additional insurance against leaks.

To remove a damaged tube, the upper cap ot the radiator is first removed to expose the upper bushings ot the tubes; the bushing ot -the damaged tube is now removed and the tube is pulled out of its lower bushing by means of a pull-rod inserted in the tube. The new tube is introduced in the manner described above.

It will be seen from the foregoing description and the drawings that there are no rigid connections between the end-plates and the tubes. as occurs when the tubes are soldered or welded directly to the end-plates. The connections in my construction is frictional only and will allow for expansion or contraction of the radiator tubes without affecting the tightness ol the connections or putting undue stresses on the end-plates, which would often cause the breaking of soldered joints.

As will be understood, as suggested herein, there may be slight changes made in the construction and arrangement of the details of my invention without departing from the field and scope of the same, and I intend to include all such variations as fall within the scope of the appended claims, in this application in which the preferred forms only of my invention have been disclosed.

What I claim is:

1. In combination with a tubular radiator, a plurality of tubes; end-plates positioned at each end of said tubes and engaged thereby; a plurality of centrally apertured bushings for securing said tubes in said endplates; said bushings having two spaced concentric shells for engaging said tubes therebetween, the outer shell being resilient,

tapered and threaded outwardly for engagement with said end-plates and smooth and straight inwardly; the inner shell being straight and smooth all over.

2. In combination with a tubular radiator, a plurality of tubes; end-plates positioned at each end of said tubes and engaged there- `by; Ia plurality of centrally apertured bushings for securing said tubes in said endplates; said bushings having two spaced concentric shells for engaging said tubes therebetween; the` outer shell being tapered and threaded outwardly for engagement with said end-plates and smooth and straight inwardly; the inner shell being straight and smooth all over, and longitudinal slots cut through saidouter shell.

3. In combination with a tubular radiator, a plurality of tubes; end-plates positioned at each end of said tubes and engaged thereby; a plurality of centrally apertured bushings for securing said bushings in said endplates; said bushings having a polygonal head and two spaced concentric shells for engaging said tubes therebetween; the outer shell being threaded outwardly for engagement with said end-plates and smooth and straight inwardly; the inner shell being straight and smooth all over, and longitudinal slots cut through said outer shell.

4. In combination with a tubular radiator, a plurality ot' tubes; end-plates positioned at each'end ot said tubes and engaged thereby; a plurality of centrally apertured bushings t'or securing said tubes in said endplates; said bushings having a polygonal head and two spaced concentric shells for engaging said tubes therebetween; the aperture in said bushing being threaded to receive a sealing plug; the outer shell being threaded outwardly for engagement with said end-plates and smooth and straight inwardly; the inner shell being straight and smooth all over, and longitudinal slots cut through said outer shell.

In testimony whereof I affix my signature.

WILLIAM J. BUETTNER.

Sil 

